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| Type | Common Name | [Latin Name] |
| Oriole | - Altamira Oriole | [Icterus gularis] |
| Oriole | - Audubon's Oriole | [Icterus graduacauda] |
| Oriole | - Baltimore Oriole | [Icterus galbula] |
| Oriole | - Black-vented Oriole | [Icterus wagleri] |
| Oriole | - Bullock's Oriole | [Icterus bullockii] |
| Oriole | - Hooded Oriole - Texas | [Icterus cucullatus sennetti] |
| Oriole | - Hooded Oriole - Western | [Icterus cucullatus nelsoni] |
| Oriole | - Orchard Oriole | [Icterus spurius] |
| Oriole | - Scott's Oriole | [Icterus parisorum] |
| Oropendola | - Crested Oropendola | [Psarocolius decumanus] |
| Osprey | - Osprey | [Pandion haliaetus] |
| Ovenbird | - Ovenbird | [Seiurus aurocapilla] |
| Owl | - American Barn Owl | [Tyto furcata] |
| Owl | - Barred Owl | [Strix varia] |
| Owl | - Boreal Owl | [Aegolius funereus] |
| Owl | - Burrowing Owl - Florida | [Aethia cunicularia cunicularia?] |
| Owl | - Burrowing Owl - Western | [Aethia cunicularia hypugaea] |
| Owl | - Elf Owl | [Micrathene whitneyi] |
| Owl | - Eurasian Eagle Owl | [Bubo bubo] |
| Owl | - Flammulated Owl | [Psiloscops flammeolus] |
| Owl | - Great Gray Owl | [Strix nebulosa] |
| Owl | - Great Horned Owl | [Bubo virginianus] |
| Owl | - Long-eared Owl | [Asio otus] |
| Owl | - Northern Hawk Owl | [Surnia ulula] |
| Owl | - Northern Saw-whet Owl | [Aegolius acadicus] |
| Owl | - Short-eared Owl | [Asio flammeus] |
| Owl | - Snowy Owl | [Nyctea scandiaca] |
| Owl | - Spotted Owl | [Strix occidentalis] |
| Owl | - Western Barn Owl | [Tyto alba] |
| Owl | - Ferruginous Pygmy-Owl | [Glaucidium brasilianum] |
| Owl | - Northern Pygmy-Owl | [Glaucidium gnoma] |
| Owl | - Eastern Screech-Owl - Eastern | [Megascops asio asio] |
| Owl | - Eastern Screech-Owl - Mexican | [Megascops asio mccallii] |
| Owl | - Eastern Screech-Owl - South Central | [Megascops asio hasbroucki] |
| Owl | - Western Screech-Owl | [Megascops kennicottii] |
| Owl | - Whiskered Screech-Owl | [Megascops trichopsis] |
| Oystercatcher | - American Oystercatcher | [Haematopus palliatus] |
| Oystercatcher | - Black Oystercatcher | [Haematopus bachmani] |
| Oystercatcher | - Eurasian Oystercatcher | [Haematopus ostralegus] |